EPIC: P2P-Blocksync

[nashqueue]

### Tracking Issues around Design
- [ ] #966
- [ ] https://github.com/rollkit/rollkit/issues/984
- [ ] #1076
- [ ] https://github.com/rollkit/rollkit/issues/1031
- [ ] https://github.com/rollkit/rollkit/issues/1110

[Manav-Aggarwal]

Closing in favor of keeping just #1110 open.